Mineral Factbook

Bournonite

CuPbSbS3IMA symbol: Bnngrandfathered

Bournonite is a sulfide or sulfosalt mineral with the formula CuPbSbS3, crystallizing in the orthorhombic system. It has a Mohs hardness of 2.5-3, typically black or gray in color, with a metallic luster, a specific gravity of 5.7-5.9. Its streak is black or gray.

Photos

Bournonite specimen photo
CarlesMillan · CC BY-SA 4.0 · Commons
Bournonite specimen photo
Ra'ike (see also: de:Benutzer:Ra'ike) · CC BY-SA 3.0 · Commons
Bournonite specimen photo
Darla Sondrol · CC0 · Commons
Bournonite specimen photo
Anagoria · CC BY 3.0 · Commons

Crystallography

Crystal systemorthorhombic crystal systemWikidata (CC0)
Space groupP n 21 m
Cell (Å, °)a = 8.153, b = 8.692, c = 7.793; α = 90, β = 90, γ = 90
Cell volume552.258 ų, Z = 4
Axial ratios0.9380:1:0.8966calculated from COD 9008197
Source structureCOD 9008197 (Zeitschrift fur Kristallographie, 1970)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.7332.683.8352.8173.8972.973
I/I₀10047.84534.633.629.7

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9008197; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)5.878 g/cm³calculated from COD 9008197
Hardness (Mohs)
3single sourceWikidata (CC0)
2.5-3single sourceDana, System of Mineralogy, 6th ed. (1892)
Specific gravity
5.7-5.9 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892)
Color
black, graysingle sourceDana, System of Mineralogy, 6th ed. (1892)
Streak
black, graysingle sourceDana, System of Mineralogy, 6th ed. (1892)
Luster
metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892)

Chemistry (calculated)

Molecular weight488.7 g/molcalculated from the IMA formula
Composition (wt%)Cu 13%, Pb 42.4%, Sb 24.92%, S 19.68%

Classification

Nickel-Strunz (10th)2.GA.50Wikidata (CC0)
Nickel-Strunz (9th)2.GA.50Wikidata (CC0)
Dana (8th)3.4.3.2Wikidata (CC0)